Bugged Map Editor

When I zoom in the map, some borders aren't shown:

Also, when I move the cursor (for example) in Cerignola, it won't show me its cities.
Browser: Google Chrome v. 80.0.3987.122 64-bit
I've tried to repuload the background but nothing has changed
What do I need to do?
Thanks

Another bug found:

Plus, when I save the second time it doesn't show me "Saving country borders...100% complete"

Wait until next day, if the borders dont show up, then the editor probably didnt saved them.

If you are unable to open the map on the editor again, then it's broken.

c l e a r c a c h e